IPI-504 blocks a protein that is in cancer cells and is also in normal cells. This protein is called Heat Shock Protein-90 (Hsp90). Hsp90 helps protect certain other proteins from being destroyed by cells. These proteins can mutate to give off signals that allow cancer cells to keep growing. By blocking the function of Hsp90, we hope that the cancer cell will block the mutated protein and cause the cancer cells to die. This drug have been used in other research studies and in the laboratory and information from those other research studies suggests that thsi drug may help to treat lung cancer with ALK mutations. In this research study, we are looking to see what effects IPI-504 has in patients with lung cancer who have an ALK mutation.